#!/usr/bin/env -S python3 -B

# This script expects the directory ~/samba-rsync-ftp to exist and to be a
# copy of the /home/ftp/pub/rsync dir on samba.org.  When the script is done,
# the git repository in the current directory will be updated, and the local
# ~/samba-rsync-ftp dir will be ready to be rsynced to samba.org.

import os, sys, re, argparse, glob, shutil, signal
from datetime import datetime
from getpass import getpass

sys.path = ['packaging'] + sys.path

from pkglib import *

os.environ['LESS'] = 'mqeiXR'; # Make sure that -F is turned off and -R is turned on.
dest = os.environ['HOME'] + '/samba-rsync-ftp'
ORIGINAL_PATH = os.environ['PATH']

def main():
    if not os.path.isfile('packaging/release-rsync'):
        die('You must run this script from the top of your rsync checkout.')

    now = datetime.now()
    cl_today = now.strftime('* %a %b %d %Y')
    year = now.strftime('%Y')
    ztoday = now.strftime('%d %b %Y')
    today = ztoday.lstrip('0')

    mandate_gensend_hook()

    curdir = os.getcwd()

    signal.signal(signal.SIGINT, signal_handler)

    if cmd_txt_chk(['packaging/prep-auto-dir']).out == '':
        die('You must setup an auto-build-save dir to use this script.');

    auto_dir, gen_files = get_gen_files(True)
    gen_pathnames = [ os.path.join(auto_dir, fn) for fn in gen_files ]

    dash_line = '=' * 74

    print(f"""\
{dash_line}
== This will release a new version of rsync onto an unsuspecting world. ==
{dash_line}
""")

    with open('build/rsync.1') as fh:
        for line in fh:
            if line.startswith(r'.\" prefix='):
                doc_prefix = line.split('=')[1].strip()
                if doc_prefix != '/usr':
                    warn(f"*** The documentation was built with prefix {doc_prefix} instead of /usr ***")
                    die("*** Read the md2man script for a way to override this. ***")
                break
            if line.startswith('.P'):
                die("Failed to find the prefix comment at the start of the rsync.1 manpage.")

    if not os.path.isdir(dest):
        die(dest, "dest does not exist")
    if not os.path.isdir('.git'):
        die("There is no .git dir in the current directory.")
    if os.path.lexists('a'):
        die('"a" must not exist in the current directory.')
    if os.path.lexists('b'):
        die('"b" must not exist in the current directory.')
    if os.path.lexists('patches.gen'):
        die('"patches.gen" must not exist in the current directory.')

    check_git_state(args.master_branch, True, 'patches')

    curversion = get_rsync_version()

    # All version values are strings!
    lastversion, last_protocol_version, pdate = get_NEWS_version_info()
    protocol_version, subprotocol_version = get_protocol_versions()

    version = curversion
    m = re.search(r'pre(\d+)', version)
    if m:
        version = re.sub(r'pre\d+', 'pre' + str(int(m[1]) + 1), version)
    else:
        version = version.replace('dev', 'pre1')

    ans = input(f"Please enter the version number of this release: [{version}] ")
    if ans == '.':
        version = re.sub(r'pre\d+', '', version)
    elif ans != '':
        version = ans
    if not re.match(r'^[\d.]+(pre\d+)?$', version):
        die(f'Invalid version: "{version}"')

    v_ver = 'v' + version
    rsync_ver = 'rsync-' + version

    if os.path.lexists(rsync_ver):
        die(f'"{rsync_ver}" must not exist in the current directory.')

    out = cmd_txt_chk(['git', 'tag', '-l', v_ver]).out
    if out != '':
        print(f"Tag {v_ver} already exists.")
        ans = input("\nDelete tag or quit? [Q/del] ")
        if not re.match(r'^del', ans, flags=re.I):
            die("Aborted")
        cmd_chk(['git', 'tag', '-d', v_ver])
        if os.path.isdir('patches/.git'):
            cmd_chk(f"cd patches && git tag -d '{v_ver}'")

    version = re.sub(r'[-.]*pre[-.]*', 'pre', version)
    if 'pre' in version and not curversion.endswith('dev'):
        lastversion = curversion

    ans = input(f"Enter the previous version to produce a patch against: [{lastversion}] ")
    if ans != '':
        lastversion = ans
    lastversion = re.sub(r'[-.]*pre[-.]*', 'pre', lastversion)

    rsync_lastver = 'rsync-' + lastversion
    if os.path.lexists(rsync_lastver):
        die(f'"{rsync_lastver}" must not exist in the current directory.')

    m = re.search(r'(pre\d+)', version)
    pre = m[1] if m else ''

    release = '0.1' if pre else '1'
    ans = input(f"Please enter the RPM release number of this release: [{release}] ")
    if ans != '':
        release = ans
    if pre:
        release += '.' + pre

    finalversion = re.sub(r'pre\d+', '', version)
    proto_changed = protocol_version != last_protocol_version
    if proto_changed:
        if finalversion in pdate:
            proto_change_date = pdate[finalversion]
        else:
            while True:
                ans = input("On what date did the protocol change to {protocol_version} get checked in? (dd Mmm yyyy) ")
                if re.match(r'^\d\d \w\w\w \d\d\d\d$', ans):
                    break
            proto_change_date = ans
    else:
        proto_change_date = ' ' * 11

    if 'pre' in lastversion:
        if not pre:
            die("You should not diff a release version against a pre-release version.")
        srcdir = srcdiffdir = lastsrcdir = 'src-previews'
        skipping = ' ** SKIPPING **'
    elif pre:
        srcdir = srcdiffdir = 'src-previews'
        lastsrcdir = 'src'
        skipping = ' ** SKIPPING **'
    else:
        srcdir = lastsrcdir = 'src'
        srcdiffdir = 'src-diffs'
        skipping = ''

    print(f"""
{dash_line}
version is "{version}"
lastversion is "{lastversion}"
dest is "{dest}"
curdir is "{curdir}"
srcdir is "{srcdir}"
srcdiffdir is "{srcdiffdir}"
lastsrcdir is "{lastsrcdir}"
release is "{release}"

About to:
    - tweak SUBPROTOCOL_VERSION in rsync.h, if needed
    - tweak the version in version.h and the spec files
    - tweak NEWS.md to ensure header values are correct
    - generate configure.sh, config.h.in, and proto.h
    - page through the differences
""")
    ans = input("<Press Enter to continue> ")

    specvars = {
        'Version:': finalversion,
        'Release:': release,
        '%define fullversion': f'%{{version}}{pre}',
        'Released': version + '.',
        '%define srcdir': srcdir,
        }

    tweak_files = 'version.h rsync.h NEWS.md'.split()
    tweak_files += glob.glob('packaging/*.spec')
    tweak_files += glob.glob('packaging/*/*.spec')

    for fn in tweak_files:
        with open(fn, 'r', encoding='utf-8') as fh:
            old_txt = txt = fh.read()
        if fn == 'version.h':
            x_re = re.compile(r'^(#define RSYNC_VERSION).*', re.M)
            msg = f"Unable to update RSYNC_VERSION in {fn}"
            txt = replace_or_die(x_re, r'\1 "%s"' % version, txt, msg)
        elif '.spec' in fn:
            for var, val in specvars.items():
                x_re = re.compile(r'^%s .*' % re.escape(var), re.M)
                txt = replace_or_die(x_re, var + ' ' + val, txt, f"Unable to update {var} in {fn}")
            x_re = re.compile(r'^\* \w\w\w \w\w\w \d\d \d\d\d\d (.*)', re.M)
            txt = replace_or_die(x_re, r'%s \1' % cl_today, txt, f"Unable to update ChangeLog header in {fn}")
        elif fn == 'rsync.h':
            x_re = re.compile('(#define\s+SUBPROTOCOL_VERSION)\s+(\d+)')
            repl = lambda m: m[1] + ' ' + ('0' if not pre or not proto_changed else '1' if m[2] == '0' else m[2])
            txt = replace_or_die(x_re, repl, txt, f"Unable to find SUBPROTOCOL_VERSION define in {fn}")
        elif fn == 'NEWS.md':
            efv = re.escape(finalversion)
            x_re = re.compile(r'^# NEWS for rsync %s \(UNRELEASED\)\s+## Changes in this version:\n' % efv
                    + r'(\n### PROTOCOL NUMBER:\s+- The protocol number was changed to \d+\.\n)?')
            rel_day = 'UNRELEASED' if pre else today
            repl = (f'# NEWS for rsync {finalversion} ({rel_day})\n\n'
                + '## Changes in this version:\n')
            if proto_changed:
                repl += f'\n### PROTOCOL NUMBER:\n\n - The protocol number was changed to {protocol_version}.\n'
            good_top = re.sub(r'\(.*?\)', '(UNRELEASED)', repl, 1)
            msg = f"The top lines of {fn} are not in the right format.  It should be:\n" + good_top
            txt = replace_or_die(x_re, repl, txt, msg)
            x_re = re.compile(r'^(\| )(\S{2} \S{3} \d{4})(\s+\|\s+%s\s+\| ).{11}(\s+\| )\S{2}(\s+\|+)$' % efv, re.M)
            repl = lambda m: m[1] + (m[2] if pre else ztoday) + m[3] + proto_change_date + m[4] + protocol_version + m[5]
            txt = replace_or_die(x_re, repl, txt, f'Unable to find "| ?? ??? {year} | {finalversion} | ... |" line in {fn}')
        else:
            die(f"Unrecognized file in tweak_files: {fn}")

        if txt != old_txt:
            print(f"Updating {fn}")
            with open(fn, 'w', encoding='utf-8') as fh:
                fh.write(txt)

    cmd_chk(['packaging/year-tweak'])

    print(dash_line)
    cmd_run("git diff".split())

    srctar_name = f"{rsync_ver}.tar.gz"
    pattar_name = f"rsync-patches-{version}.tar.gz"
    diff_name = f"{rsync_lastver}-{version}.diffs.gz"
    srctar_file = os.path.join(dest, srcdir, srctar_name)
    pattar_file = os.path.join(dest, srcdir, pattar_name)
    diff_file = os.path.join(dest, srcdiffdir, diff_name)
    lasttar_file = os.path.join(dest, lastsrcdir, rsync_lastver + '.tar.gz')

    print(f"""\
{dash_line}

About to:
    - git commit all changes
    - run a full build, ensuring that the manpages & configure.sh are up-to-date
    - merge the {args.master_branch} branch into the patch/{args.master_branch}/* branches
    - update the files in the "patches" dir and OPTIONALLY (if you type 'y') to
      run patch-update with the --make option (which opens a shell on error)
""")
    ans = input("<Press Enter OR 'y' to continue> ")

    s = cmd_run(['git', 'commit', '-a', '-m', f'Preparing for release of {version} [buildall]'])
    if s.returncode:
        die('Aborting')

    cmd_chk('touch configure.ac && packaging/smart-make && make gen')

    print('Creating any missing patch branches.')
    s = cmd_run(f'packaging/branch-from-patch --branch={args.master_branch} --add-missing')
    if s.returncode:
        die('Aborting')

    print('Updating files in "patches" dir ...')
    s = cmd_run(f'packaging/patch-update --branch={args.master_branch}')
    if s.returncode:
        die('Aborting')

    if re.match(r'^y', ans, re.I):
        print(f'\nRunning smart-make on all "patch/{args.master_branch}/*" branches ...')
        cmd_run(f"packaging/patch-update --branch={args.master_branch} --skip-check --make")

    if os.path.isdir('patches/.git'):
        s = cmd_run(f"cd patches && git commit -a -m 'The patches for {version}.'")
        if s.returncode:
            die('Aborting')

    print(f"""\
{dash_line}

About to:
    - create signed tag for this release: {v_ver}
    - create release diffs, "{diff_name}"
    - create release tar, "{srctar_name}"
    - generate {rsync_ver}/patches/* files
    - create patches tar, "{pattar_name}"
    - update top-level README.md, NEWS.md, TODO, and ChangeLog
    - update top-level rsync*.html manpages
    - gpg-sign the release files
    - update hard-linked top-level release files{skipping}
""")
    ans = input("<Press Enter to continue> ")

    # TODO: is there a better way to ensure that our passphrase is in the agent?
    cmd_run("touch TeMp; gpg --sign TeMp; rm TeMp*")

    out = cmd_txt(f"git tag -s -m 'Version {version}.' {v_ver}", capture='combined').out
    print(out, end='')
    if 'bad passphrase' in out or 'failed' in out:
        die('Aborting')

    if os.path.isdir('patches/.git'):
        out = cmd_txt(f"cd patches && git tag -s -m 'Version {version}.' {v_ver}", capture='combined').out
        print(out, end='')
        if 'bad passphrase' in out or 'failed' in out:
            die('Aborting')

    os.environ['PATH'] = ORIGINAL_PATH

    # Extract the generated files from the old tar.
    tweaked_gen_files = [ os.path.join(rsync_lastver, fn) for fn in gen_files ]
    cmd_run(['tar', 'xzf', lasttar_file, *tweaked_gen_files])
    os.rename(rsync_lastver, 'a')

    print(f"Creating {diff_file} ...")
    cmd_chk(['rsync', '-a', *gen_pathnames, 'b/'])

    sed_script = r's:^((---|\+\+\+) [ab]/[^\t]+)\t.*:\1:' # CAUTION: must not contain any single quotes!
    cmd_chk(f"(git diff v{lastversion} {v_ver} -- ':!.github'; diff -upN a b | sed -r '{sed_script}') | gzip -9 >{diff_file}")
    shutil.rmtree('a')
    os.rename('b', rsync_ver)

    print(f"Creating {srctar_file} ...")
    cmd_chk(f"git archive --format=tar --prefix={rsync_ver}/ {v_ver} | tar xf -")
    cmd_chk(f"support/git-set-file-times --quiet --prefix={rsync_ver}/")
    cmd_chk(['fakeroot', 'tar', 'czf', srctar_file, '--exclude=.github', rsync_ver])
    shutil.rmtree(rsync_ver)

    print(f'Updating files in "{rsync_ver}/patches" dir ...')
    os.mkdir(rsync_ver, 0o755)
    os.mkdir(f"{rsync_ver}/patches", 0o755)
    cmd_chk(f"packaging/patch-update --skip-check --branch={args.master_branch} --gen={rsync_ver}/patches".split())

    print(f"Creating {pattar_file} ...")
    cmd_chk(['fakeroot', 'tar', 'chzf', pattar_file, rsync_ver + '/patches'])
    shutil.rmtree(rsync_ver)

    print(f"Updating the other files in {dest} ...")
    md_files = 'README.md NEWS.md INSTALL.md'.split()
    html_files = [ fn for fn in gen_pathnames if fn.endswith('.html') ]
    cmd_chk(['rsync', '-a', *md_files, *html_files, dest])
    cmd_chk(["./md-convert", "--dest", dest, *md_files])

    cmd_chk(f"git log --name-status | gzip -9 >{dest}/ChangeLog.gz")

    for fn in (srctar_file, pattar_file, diff_file):
        asc_fn = fn + '.asc'
        if os.path.lexists(asc_fn):
            os.unlink(asc_fn)
        res = cmd_run(['gpg', '--batch', '-ba', fn])
        if res.returncode != 0 and res.returncode != 2:
            die("gpg signing failed")

    if not pre:
        for find in f'{dest}/rsync-*.gz {dest}/rsync-*.asc {dest}/src-previews/rsync-*diffs.gz*'.split():
            for fn in glob.glob(find):
                os.unlink(fn)
        top_link = [
                srctar_file, f"{srctar_file}.asc",
                pattar_file, f"{pattar_file}.asc",
                diff_file, f"{diff_file}.asc",
                ]
        for fn in top_link:
            os.link(fn, re.sub(r'/src(-\w+)?/', '/', fn))

    print(f"""\
{dash_line}

Local changes are done.  When you're satisfied, push the git repository
and rsync the release files.  Remember to announce the release on *BOTH*
rsync-announce@lists.samba.org and rsync@lists.samba.org (and the web)!
""")


def replace_or_die(regex, repl, txt, die_msg):
    m = regex.search(txt)
    if not m:
        die(die_msg)
    return regex.sub(repl, txt, 1)


def signal_handler(sig, frame):
    die("\nAborting due to SIGINT.")


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="Prepare a new release of rsync in the git repo & ftp dir.", add_help=False)
    parser.add_argument('--branch', '-b', dest='master_branch', default='master', help="The branch to release. Default: master.")
    parser.add_argument("--help", "-h", action="help", help="Output this help message and exit.")
    args = parser.parse_args()
    main()

# vim: sw=4 et ft=python
